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According to KMT, at constant pressure and temperature, the frequency and force of molecule-wall collisions are constant. So increasing the number of gaseous molecules will require a proportional increase in the container volume in order to yield a decrease in the number of collisions per unit area to make up for the increased frequency of collisions. What gas law is KMT explaining?

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Answer:

Boyle´s Law

Explanation:

If we increase the volume of a gas, its pressure will decrease that is why in this question the pressure was decreased to  yield the decrease in the number of collisions.

This is Boyle´s law which states that the pressure of a gas is inversely proportional to the volume of its container.

It is expressed mathematically  as P₁V₁ = P₂V₂

where the subscripts refer to intial and final conditions.

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